LIGHT SENSING CIRCUIT, LIQUID CRYSTAL DISPLAY COMPRISING THE SAME AND DRIVIDNG METHOD OF THE SAME
PURPOSE: A light sensing circuit, a liquid crystal display comprising the same and driving method of the same are provided to obtain same digital output at about the same ambient light without the deviation between sensors. CONSTITUTION: A light sensing circuit includes a sensor unit(120), a voltage...
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Main Author | |
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Format | Patent |
Language | English Korean |
Published |
03.03.2010
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Subjects | |
Online Access | Get full text |
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Summary: | PURPOSE: A light sensing circuit, a liquid crystal display comprising the same and driving method of the same are provided to obtain same digital output at about the same ambient light without the deviation between sensors. CONSTITUTION: A light sensing circuit includes a sensor unit(120), a voltage generation unit, and a readout circuit(130). The sensor unit outputs a first different value between a third current and a second current and it outputs a second difference value between a first current and a second current. The voltage generation unit generates reference voltage in response to the first difference value and also generates sensing voltage in response to the second difference value. The readout circuit detects the first rise time and detects a second rise time based on the detected first rise time, and then outputs the detected second rise time as the luminance of an external light. |
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Bibliography: | Application Number: KR20080081469 |